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boot: Add logic to enable booting from fallback option

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The "fallback" extlinux config option allows us to set an alternative
default boot option for when it has been detected that the default is
failing. Implement the logic required to boot from this option when
desired.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Martyn Welch
2024-10-15 10:24:27 -06:00
committed by Tom Rini
parent d2faad3ff3
commit 8ba82a91b3
6 changed files with 27 additions and 7 deletions
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boot/pxe_utils.c
+13 -1
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@@ -1436,6 +1436,16 @@ struct pxe_menu *parse_pxefile(struct pxe_context *ctx, unsigned long menucfg)
buf = map_sysmem(menucfg, 0);
r = parse_pxefile_top(ctx, buf, menucfg, cfg, 1);
if (ctx->use_fallback) {
if (cfg->fallback_label) {
printf("Setting use of fallback\n");
cfg->default_label = cfg->fallback_label;
} else {
printf("Selected fallback option, but not set\n");
}
}
unmap_sysmem(buf);
if (r < 0) {
destroy_pxe_menu(cfg);
@@ -1586,7 +1596,8 @@ void handle_pxe_menu(struct pxe_context *ctx, struct pxe_menu *cfg)
int pxe_setup_ctx(struct pxe_context *ctx, struct cmd_tbl *cmdtp,
pxe_getfile_func getfile, void *userdata,
bool allow_abs_path, const char *bootfile, bool use_ipv6)
bool allow_abs_path, const char *bootfile, bool use_ipv6,
bool use_fallback)
{
const char *last_slash;
size_t path_len = 0;
@@ -1597,6 +1608,7 @@ int pxe_setup_ctx(struct pxe_context *ctx, struct cmd_tbl *cmdtp,
ctx->userdata = userdata;
ctx->allow_abs_path = allow_abs_path;
ctx->use_ipv6 = use_ipv6;
ctx->use_fallback = use_fallback;
/* figure out the boot directory, if there is one */
if (bootfile && strlen(bootfile) >= MAX_TFTP_PATH_LEN)